Aliens vs. Predator
Yes, Aliens and Predator were both movies, and it seems natural to bring them together in one movie. However, it took a comic book to achieve it first. Dark Horse created the first AvP with their miniseries in 1989. The popularity of the comic series led to the interest in the property that led to the final movie. The movie was released in 2004 and starred Sanaa Lathan and Lance Henriksen. It is the first installment of the Alien vs. Predator franchise.